var _global =
    typeof window === "object" && window.window === window
        ? window
        : typeof self === "object" && self.self === self
        ? self
        : typeof global === "object" && global.global === global
        ? global
        : this;

function bom(blob, opts) {
    if (typeof opts === "undefined") opts = { autoBom: false };
    else if (typeof opts !== "object") {
        console.warn("Deprecated: Expected third argument to be a object");
        opts = { autoBom: !opts };
    }

    // prepend BOM for UTF-8 XML and text/* types (including HTML)
    // note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
    if (
        opts.autoBom &&
        /^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(
            blob.type
        )
    ) {
        return new Blob([String.fromCharCode(0xfeff), blob], {
            type: blob.type,
        });
    }
    return blob;
}

function download(url, name, opts) {
    var xhr = new XMLHttpRequest();
    xhr.open("GET", url);
    xhr.responseType = "blob";
    xhr.onload = function () {
        saveAs(xhr.response, name, opts);
    };
    xhr.onerror = function () {
        console.error("could not download file");
    };
    xhr.send();
}

function corsEnabled(url) {
    var xhr = new XMLHttpRequest();
    // use sync to avoid popup blocker
    xhr.open("HEAD", url, false);
    xhr.send();
    return xhr.status >= 200 && xhr.status <= 299;
}

// `a.click()` doesn't work for all browsers (#465)
function click(node) {
    try {
        node.dispatchEvent(new MouseEvent("click"));
    } catch (e) {
        var evt = document.createEvent("MouseEvents");
        evt.initMouseEvent(
            "click",
            true,
            true,
            window,
            0,
            0,
            0,
            80,
            20,
            false,
            false,
            false,
            false,
            0,
            null
        );
        node.dispatchEvent(evt);
    }
}

var saveAs =
    _global.saveAs ||
    // probably in some web worker
    (typeof window !== "object" || window !== _global
        ? function saveAs() {
              /* noop */
          }
        : // Use download attribute first if possible (#193 Lumia mobile)
        "download" in HTMLAnchorElement.prototype
        ? function saveAs(blob, name, opts) {
              var URL = _global.URL || _global.webkitURL;
              var a = document.createElement("a");
              name = name || blob.name || "download";

              a.download = name;
              a.rel = "noopener"; // tabnabbing

              // TODO: detect chrome extensions & packaged apps
              // a.target = '_blank'

              if (typeof blob === "string") {
                  // Support regular links
                  a.href = blob;
                  if (a.origin !== location.origin) {
                      corsEnabled(a.href)
                          ? download(blob, name, opts)
                          : click(a, (a.target = "_blank"));
                  } else {
                      click(a);
                  }
              } else {
                  // Support blobs
                  a.href = URL.createObjectURL(blob);
                  setTimeout(function () {
                      URL.revokeObjectURL(a.href);
                  }, 4e4); // 40s
                  setTimeout(function () {
                      click(a);
                  }, 0);
              }
          }
        : // Use msSaveOrOpenBlob as a second approach
        "msSaveOrOpenBlob" in navigator
        ? function saveAs(blob, name, opts) {
              name = name || blob.name || "download";

              if (typeof blob === "string") {
                  if (corsEnabled(blob)) {
                      download(blob, name, opts);
                  } else {
                      var a = document.createElement("a");
                      a.href = blob;
                      a.target = "_blank";
                      setTimeout(function () {
                          click(a);
                      });
                  }
              } else {
                  navigator.msSaveOrOpenBlob(bom(blob, opts), name);
              }
          }
        : // Fallback to using FileReader and a popup
          function saveAs(blob, name, opts, popup) {
              // Open a popup immediately do go around popup blocker
              // Mostly only available on user interaction and the fileReader is async so...
              popup = popup || open("", "_blank");
              if (popup) {
                  popup.document.title = popup.document.body.innerText =
                      "downloading...";
              }

              if (typeof blob === "string") return download(blob, name, opts);

              var force = blob.type === "application/octet-stream";
              var isSafari =
                  /constructor/i.test(_global.HTMLElement) || _global.safari;
              var isChromeIOS = /CriOS\/[\d]+/.test(navigator.userAgent);

              if (
                  (isChromeIOS || (force && isSafari)) &&
                  typeof FileReader === "object"
              ) {
                  // Safari doesn't allow downloading of blob URLs
                  var reader = new FileReader();
                  reader.onloadend = function () {
                      var url = reader.result;
                      url = isChromeIOS
                          ? url
                          : url.replace(
                                /^data:[^;]*;/,
                                "data:attachment/file;"
                            );
                      if (popup) popup.location.href = url;
                      else location = url;
                      popup = null; // reverse-tabnabbing #460
                  };
                  reader.readAsDataURL(blob);
              } else {
                  var URL = _global.URL || _global.webkitURL;
                  var url = URL.createObjectURL(blob);
                  if (popup) popup.location = url;
                  else location.href = url;
                  popup = null; // reverse-tabnabbing #460
                  setTimeout(function () {
                      URL.revokeObjectURL(url);
                  }, 4e4); // 40s
              }
          });

_global.saveAs = saveAs.saveAs = saveAs;

if (typeof module !== "undefined") {
    module.exports = saveAs;
}
